I had a go at ranking New Zealand blogs at the end of February (see Rating NZ blogs). A month later I think I will try again. But first – let’s check out the ranking method I am using.
This is similar to that used in the Atheist Blog Ranking which ranks each available statistics and then aggregates these ranks to produce an over all rank. Hopefully the procedure evens out the quirks inevitable in ranking using individual statistical measures.
One problem with my procedure is that different blog rating statistics are inevitably correlated to some extent. After all, they all attempt to provide a measure of blog “popularity.” However, it turns out that some are more highly correlated than others and these will introduce a “double dipping” influence on the final ranking.
I have now had a look at the data for 80 NZ blogs (mid March 09) and found that Alexa Rank and Alexa Reach effectively produce the same result. Almost 90% of the variation in one is explained by the other. Similarly 94% of the variation in Technorati Authority is explained by Technorati Rank. Also Technorati Blog Reactions (Links) is quite strongly correlated with Technorati Authority (68% of the variation explained).
These correlations are depicted in the figures. You can download the complete correlation analysis if interested (rank-correlations.pdf).
Using these analyses I have settled on the following list of statistical indicators:
These 10 ranking procedures also enable me to rank blogs for their effectiveness for different categories – rank statistics, links and RSS feed subscriptions. Useful if one wishes to decide the most effective way of improving overall blog ranking.
I’ll post my blog rankings for March seperately.